Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f0919494bc81a3…

MALICIOUS

PDF

72.4 KB Created: 2021-04-26 13:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 905e95cfbbb6b42fba508ec0474efc23 SHA-1: c5bba0d173be102ba1a4019bd5131cd199ecbe6a SHA-256: c7f0919494bc81a380442ddcc0aea9b04df639f60752e7ac4142a28e95d42077
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing lures that may leverage embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=iso+27001+certification+cost+in+india PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5ff654b281863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_605ca1c759520.pdfIn PDF document text
    • http://curvepreloved.com/wemavoxuluti3ioi8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5ff47addb5387.pdfIn PDF document text
    • http://servicesforsupport.com/longman_exams_dictionary_free_downloadfheaw.pdfIn PDF document text
    • https://demiwuvaduze.weebly.com/uploads/1/3/4/9/134904833/lilixeg.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/dddc586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_602aa27fa1845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5fff68a1d6ab3.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/9364158.pdfIn PDF document text
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/e72d8255.pdfIn PDF document text
    • http://sallles.ru/steam_engine_archimedes_shipscotrp.pdfIn PDF document text
    • https://basoxafal.weebly.com/uploads/1/3/4/4/134499196/af78e.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/hvac_test_questions_and_answers.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/jividuzujutali.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/1394277.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/fadenojegebanetamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_606828313b5fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 5328 bytes
SHA-256: db3912c28da16a8db66cb604bc481bb0e08995e4e82db972d49336294aaf8815
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10960 bytes
SHA-256: cad46320797253730c83dfde56a3f43ed2db10f9a9a358f4f01efbd44c141db1

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